Injection Molding
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Product has short shots, flash, or unstable dimensions
Problem Phenomenon
The product has short shots, flash, or unstable dimensions, related to the injection pressure setting
Cause Analysis
Injection pressure too high, producing flash and internal stress
Injection pressure too low, causing material shortage and short shot
Holding pressure set improperly, affecting dimensions and shrinkage
Pressure switchover point set unreasonably
Hydraulic system unstable, pressure fluctuation
Solution
Reasonably set injection pressure according to cellulose acetate butyrate characteristics
Holding pressure is usually 60-80% of injection pressure
Optimize the pressure switchover point (V-P switchover)
Check hydraulic system stability
Avoid excessive pressure producing flash
Key Takeaway
Injection pressure needs to be reasonably set according to material and product
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